I made a small firework and achievement VFX system and decided to release it for free.
You can copy it, edit it, and use it in your own game. It is open-source, so feel free to change the effects, keybinds, configs, or how it works.
What it includes
- Firework system
- Achievement VFX system
- Separate modules for fireworks and achievements
- Simple config modules
- Client input support
- Server replication so other players can see the effects
How it works
The firework system uses its own event, config, client script, server script, and effect module. The achievement system works in a similar way, but uses the E key. You can also edit the config modules if you want to change cooldowns, lifetime, offsets, or other settings.
License
Free to use, free to grab, and open-source or whatever.
Credits are not required, but they are always appreciated 
If you improve it, remake it, or add more effects, feel free to post your version too.
Download:
Fireworks+AchievementEffects.rbxl (99.4 KB)
Showcase:
Link to the project page